2 see copyright notice in squirrel.h
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4 #include "sqpcheader.h"
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7 #include "sqfuncproto.h"
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8 #include "sqclosure.h"
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10 SQTable::SQTable(SQSharedState *ss,SQInteger nInitialSize)
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12 SQInteger pow2size=MINPOWER2;
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13 while(nInitialSize>pow2size)pow2size=pow2size<<1;
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14 AllocNodes(pow2size);
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18 ADD_TO_CHAIN(&_sharedstate->_gc_chain,this);
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21 void SQTable::Remove(const SQObjectPtr &key)
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23 _HashNode *n = _Get(key, HashKey(key) & (_numofnodes - 1));
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25 n->val = n->key = _null_;
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31 void SQTable::AllocNodes(SQInteger nSize)
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33 _HashNode *nodes=(_HashNode *)SQ_MALLOC(sizeof(_HashNode)*nSize);
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34 for(SQInteger i=0;i<nSize;i++){
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35 new (&nodes[i]) _HashNode;
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40 _firstfree=&_nodes[_numofnodes-1];
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43 void SQTable::Rehash(bool force)
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45 SQInteger oldsize=_numofnodes;
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46 //prevent problems with the integer division
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47 if(oldsize<4)oldsize=4;
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48 _HashNode *nold=_nodes;
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49 SQInteger nelems=CountUsed();
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50 if (nelems >= oldsize-oldsize/4) /* using more than 3/4? */
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51 AllocNodes(oldsize*2);
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52 else if (nelems <= oldsize/4 && /* less than 1/4? */
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53 oldsize > MINPOWER2)
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54 AllocNodes(oldsize/2);
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56 AllocNodes(oldsize);
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60 for (SQInteger i=0; i<oldsize; i++) {
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61 _HashNode *old = nold+i;
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62 if (type(old->key) != OT_NULL)
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63 NewSlot(old->key,old->val);
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65 for(SQInteger k=0;k<oldsize;k++)
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66 nold[k].~_HashNode();
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67 SQ_FREE(nold,oldsize*sizeof(_HashNode));
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70 SQTable *SQTable::Clone()
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72 SQTable *nt=Create(_opt_ss(this),_numofnodes);
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74 SQObjectPtr key,val;
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75 while((ridx=Next(true,ridx,key,val))!=-1){
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76 nt->NewSlot(key,val);
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78 nt->SetDelegate(_delegate);
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82 bool SQTable::Get(const SQObjectPtr &key,SQObjectPtr &val)
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84 _HashNode *n = _Get(key, HashKey(key) & (_numofnodes - 1));
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86 val = _realval(n->val);
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91 bool SQTable::NewSlot(const SQObjectPtr &key,const SQObjectPtr &val)
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93 SQHash h = HashKey(key) & (_numofnodes - 1);
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94 _HashNode *n = _Get(key, h);
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99 _HashNode *mp = &_nodes[h];
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102 //key not found I'll insert it
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103 //main pos is not free
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105 if(type(mp->key)!=OT_NULL) {
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107 _HashNode *othern; /* main position of colliding node */
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108 n = _firstfree; /* get a free place */
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109 if (mp > n && (othern = &_nodes[h]) != mp){
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110 /* yes; move colliding node into free position */
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111 while (othern->next != mp)
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112 othern = othern->next; /* find previous */
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113 othern->next = n; /* redo the chain with `n' in place of `mp' */
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114 *n = *mp; /* copy colliding node into free pos. (mp->next also goes) */
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115 mp->next = NULL; /* now `mp' is free */
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118 /* new node will go into free position */
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119 n->next = mp->next; /* chain new position */
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126 for (;;) { /* correct `firstfree' */
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127 if (type(_firstfree->key) == OT_NULL) {
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130 return true; /* OK; table still has a free place */
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132 else if (_firstfree == _nodes) break; /* cannot decrement from here */
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133 else (_firstfree)--;
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136 return NewSlot(key, val);
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139 SQInteger SQTable::Next(bool getweakrefs,const SQObjectPtr &refpos, SQObjectPtr &outkey, SQObjectPtr &outval)
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141 SQInteger idx = (SQInteger)TranslateIndex(refpos);
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142 while (idx < _numofnodes) {
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143 if(type(_nodes[idx].key) != OT_NULL) {
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145 _HashNode &n = _nodes[idx];
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147 outval = getweakrefs?(SQObject)n.val:_realval(n.val);
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148 //return idx for the next iteration
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153 //nothing to iterate anymore
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158 bool SQTable::Set(const SQObjectPtr &key, const SQObjectPtr &val)
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160 _HashNode *n = _Get(key, HashKey(key) & (_numofnodes - 1));
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168 void SQTable::Finalize()
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170 for(SQInteger i = 0;i < _numofnodes; i++) { _nodes[i].key = _null_; _nodes[i].val = _null_; }
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